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arxiv: 2606.06580 · v1 · pith:RWSK6RZ3new · submitted 2026-06-04 · ✦ hep-ph · astro-ph.HE

Neutrino mass ordering from the next Galactic supernova at DUNE, HK, and JUNO

Pith reviewed 2026-06-28 00:15 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.HE
keywords neutrino mass orderingcore-collapse supernovaneutronization burstDUNEHyper-KamiokandeJUNOneutrino oscillationssupernova neutrinos
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The pith

The neutronization burst allows DUNE and Hyper-Kamiokande to discriminate neutrino mass ordering at high significance in the next Galactic supernova.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper establishes that the sharp peak in electron neutrinos known as the neutronization burst during a core-collapse supernova provides a clean signature whose presence or absence directly indicates whether the neutrino mass ordering is normal or inverted. For a supernova at 10 kpc this signature yields at least 6 sigma sensitivity at DUNE and 4 sigma at Hyper-Kamiokande and stays largely independent of the details of the supernova simulation. The rise-time of the electron antineutrino flux in the accretion phase supplies extra discrimination power once cumulative and ratio observables at 20 ms and 100 ms are used to reduce effects from different progenitor masses, reaching roughly 5 sigma at Hyper-Kamiokande and 3 sigma at JUNO. A reader would care because the next Galactic supernova offers a realistic chance to settle the mass-ordering question with astrophysical neutrinos before or alongside results from long-baseline accelerator experiments.

Core claim

Using realistic core-collapse supernova simulations for multiple progenitor masses the neutronization burst remains largely independent of hydrodynamic simulation models and enables DUNE and HK to achieve greater than or equal to 6 sigma and 4 sigma sensitivity respectively for discriminating normal from inverted neutrino mass ordering. The rise-time observable after constructing cumulative and ratio-based measures at characteristic timescales of 20 ms and 100 ms to mitigate degeneracies provides about 5 sigma and 3 sigma discrimination in HK and JUNO. Combining both the burst and accretion phase information is crucial for a definitive determination of the mass ordering from the next Galacti

What carries the argument

The neutronization burst, a sharp electron-neutrino peak within the first 20-30 ms after core bounce whose appearance or disappearance depends on the mass ordering, together with the faster rise-time of heavy-lepton neutrinos that affects the oscillated electron-antineutrino signal during the accretion phase.

If this is right

  • DUNE reaches at least 6 sigma sensitivity to mass ordering using only the neutronization burst.
  • Hyper-Kamiokande reaches at least 4 sigma sensitivity using the same burst observable.
  • After mitigation of progenitor effects the rise-time observable yields about 5 sigma in Hyper-Kamiokande and 3 sigma in JUNO.
  • The neutronization burst signature remains robust across different progenitor masses and simulation models.
  • Combining burst and rise-time information from the three detectors enables a definitive mass-ordering determination.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the claimed model independence of the burst holds, the same observable could be applied to supernovae at larger distances with only modest loss in significance.
  • Additional multi-dimensional supernova simulations could test whether the ratio observables at fixed times continue to suppress progenitor degeneracies.
  • The method offers a potential cross-check against mass-ordering results expected from reactor or accelerator neutrino experiments within the coming decade.

Load-bearing premise

That the neutronization burst stays independent of the details in the chosen supernova simulations and that the post-hoc cumulative and ratio observables at 20 ms and 100 ms remove enough progenitor-mass degeneracies for the rise-time to give reliable ordering discrimination.

What would settle it

Detection of a Galactic supernova in which the electron-neutrino burst is absent when normal ordering predicts it should appear or present when inverted ordering predicts absence, or in which the statistical separation between orderings from the rise-time observables falls well below the quoted sigma values.

read the original abstract

The next Galactic core-collapse supernova (CCSN) will offer a unique opportunity to determine the neutrino mass ordering. We focus on two observables: the electron neutrino ($\nu_e$) neutronization burst and the rise-time of the electron antineutrino ($\bar{\nu}_e$) flux during the accretion phase. The neutronization burst, a sharp $\nu_e$ peak within $\sim 20$-$30$ ms, provides a clean and robust signature of mass ordering through its appearance or disappearance. During the accretion phase, the faster rise of heavy lepton flavor neutrinos ($\nu_x$) leads to a distinct faster rise-time behavior of the oscillated $\bar{\nu}_e$ signal, resulting in mass ordering discrimination. Using realistic CCSN simulations for multiple progenitor masses, we compute event rates and perform a statistical analysis for a Galactic ($10$~kpc) CCSN event at DUNE, Hyper-Kamiokande (HK), and JUNO detectors. The neutronization burst remains largely independent of SN hydrodynamic simulation models, with DUNE and HK achieving $\gtrsim 6\sigma$ and $\gtrsim 4\sigma$ sensitivity for normal (NO) to inverted ordering (IO) discrimination, respectively. However, the rise-time observable is prone to progenitor degeneracies. To mitigate this cumulative and ratio-based observables constructed at characteristic timescales ($20$ ms & $100$ ms) are used. The resulting confidence levels from the rise-time analysis to discriminate IO/NO in HK and JUNO are $\sim 5\sigma$ and $\sim 3\sigma$, respectively. Our results highlight the complementarity of detectors and observables, and demonstrate that combining neutronization burst and accretion phase information will be crucial for a definitive determination of the neutrino mass ordering in the next Galactic supernova.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The manuscript analyzes how a Galactic core-collapse supernova at 10 kpc can determine the neutrino mass ordering via two channels: the ν_e neutronization burst (claimed largely model-independent) and the ar{ν}_e rise-time during accretion. Using multiple progenitor CCSN simulations, it computes event rates and significances at DUNE, HK, and JUNO, reporting ≳6σ (DUNE) and ≳4σ (HK) for the burst, and ~5σ (HK) and ~3σ (JUNO) for the rise-time after applying cumulative/ratio observables at 20 ms and 100 ms to address progenitor degeneracies.

Significance. If the central claims hold, the paper supplies concrete, detector-specific forecasts for mass-ordering sensitivity from the next Galactic supernova and demonstrates complementarity between the burst and accretion-phase observables. The explicit use of multiple progenitor masses is a positive step toward robustness.

major comments (2)
  1. [Abstract] Abstract: The statement that cumulative and ratio observables at 20 ms and 100 ms suffice to remove progenitor-mass degeneracies in the rise-time channel (yielding ~5σ at HK and ~3σ at JUNO) is load-bearing for that part of the result, yet the manuscript provides no quantitative test showing that the residual spread of the test statistic across the full progenitor set is smaller than the NO/IO separation.
  2. The central sensitivities rest on external CCSN simulations whose validation, error treatment, and exact statistical procedure (including how the test statistic is constructed and whether it accounts for all simulation variants) are not visible in the provided description; this affects the claimed model-independence of the neutronization burst and the mitigated rise-time results.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback. We address the major comments point-by-point below. Where the manuscript lacked explicit quantitative support or procedural detail, we have revised accordingly to strengthen the presentation without altering the core results.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The statement that cumulative and ratio observables at 20 ms and 100 ms suffice to remove progenitor-mass degeneracies in the rise-time channel (yielding ~5σ at HK and ~3σ at JUNO) is load-bearing for that part of the result, yet the manuscript provides no quantitative test showing that the residual spread of the test statistic across the full progenitor set is smaller than the NO/IO separation.

    Authors: We agree that an explicit quantitative comparison of residual progenitor-induced spread versus the NO/IO separation is needed to fully substantiate the claim. In the revised manuscript we have added a new panel (Figure 7) displaying the distributions of the cumulative and ratio observables across the entire progenitor ensemble for both mass orderings. The figure shows that the 1σ width of each distribution is smaller than the separation between the NO and IO means, directly supporting the reported ~5σ (HK) and ~3σ (JUNO) significances. The abstract has been updated to reference this test. revision: yes

  2. Referee: The central sensitivities rest on external CCSN simulations whose validation, error treatment, and exact statistical procedure (including how the test statistic is constructed and whether it accounts for all simulation variants) are not visible in the provided description; this affects the claimed model-independence of the neutronization burst and the mitigated rise-time results.

    Authors: Section 4 defines the test statistic explicitly as the difference (burst channel) or ratio (rise-time channel) of binned event rates, with significance obtained from the separation of ensemble means divided by the quadrature sum of standard deviations computed over all simulation variants. The full set of progenitors is used to estimate variance, thereby incorporating simulation-to-simulation differences. Model-independence of the neutronization burst is shown in Figure 3, where the early-time ν_e flux is consistent across progenitors within the quoted 20–30 ms window. We have added a new paragraph in Section 2 summarizing the provenance, known hydrodynamic uncertainties, and error propagation from the external simulation suites (references therein). These additions make the procedure and robustness arguments fully visible. revision: partial

Circularity Check

0 steps flagged

No circularity; derivation uses external simulations and standard detector modeling

full rationale

The paper's sensitivity estimates for NO/IO discrimination derive from external CCSN simulations across multiple progenitor masses, standard neutrino oscillation and detector response calculations, and statistical analysis of event rates. The neutronization burst is treated as largely model-independent on the basis of those simulations, while the accretion-phase rise-time mitigation relies on post-hoc cumulative and ratio observables at fixed 20 ms and 100 ms timescales; neither step reduces by construction to the target mass-ordering result, nor does the text invoke load-bearing self-citations or fitted parameters renamed as predictions. The derivation chain remains self-contained against the cited external inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The analysis depends on the accuracy of existing CCSN neutrino-emission simulations and on standard neutrino-oscillation parameters taken from prior experiments; no new entities are introduced.

axioms (2)
  • domain assumption CCSN hydrodynamic simulations for multiple progenitor masses accurately capture the time-dependent neutrino fluxes and spectra
    Invoked to compute event rates and rise-time behavior for both mass orderings
  • standard math Neutrino oscillation parameters, mixing angles and mass-squared differences are known from prior measurements
    Used to map flavor fluxes to detector signals

pith-pipeline@v0.9.1-grok · 5880 in / 1352 out tokens · 22854 ms · 2026-06-28T00:15:32.751699+00:00 · methodology

discussion (0)

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Reference graph

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